var images_LIs = [];
var currentImageLI = 1;
var maxImageLI = 0;
var help_image_switches_osd_element;

function setupHelpImages() {
	var element = document.getElementById('help_image_holder');
	images_LIs = element.getElementsByTagName('ul')[0].getElementsByTagName('li');
	maxImageLI = images_LIs.length;
	if (maxImageLI < 2) {
	} else {
		document.getElementById('help_image_switches').style.display = 'block';
		help_image_switches_osd_element = document.getElementById('help_image_switches_osd');
		fixOSD();
	}
}

function prevImage () {
	if (currentImageLI > 1) {
		images_LIs[currentImageLI - 1].style.display = 'none';
		currentImageLI --;
		images_LIs[currentImageLI - 1].style.display = 'block';
		fixOSD();
	}
	return false;
}

function nextImage () {
	if (currentImageLI < maxImageLI) {
		images_LIs[currentImageLI - 1].style.display = 'none';
		currentImageLI ++;
		images_LIs[currentImageLI - 1].style.display = 'block';
		fixOSD();
	}
	return false;
}

function fixOSD () {
	help_image_switches_osd_element.innerHTML = currentImageLI + ' of ' + maxImageLI;
}

function onZoomClick () {
	var img = images_LIs[currentImageLI - 1].getElementsByTagName('img')[0];
	var chunk = img.src.split('#');
	var src = chunk[0].replace(/-t/, '');
	var rel = chunk[1];
	window.open (src, '', rel +',toolbar=0,menubar=0,directories=0');
	return false;
}